from seleniumbase import SB

PROXY = "USER:PASS@HOST:PORT"

with SB(uc=True, proxy=PROXY) as sb:

sb.open("https://whatismyipaddress.com/")input("Press Enter to close...")

this same code opens on my pc with extension appearing and proxy is working
but on another pc extension is not there (and there is AI mode beside google search when chrome opens before redirecting to url but I think this won't differ)